Novak Djokovic and Serena Williams once again find themselves perched high above the competition ahead of the 2015 U.S. Open beginning Monday at Flushing Meadows in Flushing, New York.

Eyeing his third slam victory of the year, No. 1 Djokovic will enter the tournament as the men’s top seed while Williams aims to complete the ever rare Grand Slam after claiming the season’s first three major titles.

Following his wins at Wimbledon and the Australian Open, Djokovic is just ahead of No. 2 and second-seeded rival Roger Federer, with No. 3 Andy Murray rounding out the men’s side. Spain’s Rafael Nadal is the eighth seed, while defending champion Marin Cilic is the ninth.

Williams, also in pursuit of her fourth-straight U.S. Open title, will contend with second-seed Simona Halep, third-seed Maria Sharapova, and fourth Caroline Wozniacki. The 33-year-old Williams seeks her 22nd career slam and has lost only two matches all year.

Success hasn’t come easy in Flushing for Djokovic, who last won the year’s final slam way back in 2011 and has appeared in two of the last three championship matches.

Williams has reached the U.S. finals four straight times, and hasn’t lost at Flushing Meadows since 2011.

The tournament begins Monday, Aug. 31 and the opening three rounds wrap up the evening of Saturday, Sept. 5. The knockout phases begin Sept. 6, with the quarterfinals on Sept. 8, the women’s semifinals on Sept. 10 and the final on Sept. 12. The men’s semis take place Sept. 11 and the final is Sept. 13.

Tickets for the two-week long event are available through in the form of day and night session passes for Arthur Ashe Stadium and Louis Armstrong Stadium as well as Open grounds admission passes for the Billie Jean King National Tennis Center.

A day pass at Arthur Ashe currently runs between $70 to $470 for the first day of the tournament, $110 to $190 at Louis Armstrong, and $70 each for the grounds admission.

From there the amounts increase incrementally, with a single ticket for the men’s final running between $185 to more than $1,770 and the women’s final going for as little as $160 to more than $1,270.